| http://www.w3.org/ns/prov#value | - Some people, for example, insist on tangibility as a criterion of the real, while others think that models and theories are real only if they are useful or operationally successful, rather than descriptive.I love the tangibility of a CD - its cover art and liner notes.OK, paying for stamps is a total pain and email is free, but there is something to be said for the tangibility of the letter.
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